<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>sessionStorage</title>
  </head>
  <body>
    <h2>sessionStorage</h2>
    <button onclick="saveData()">点我保存一个数据</button>
    <button onclick="readData()">点我读取一个数据</button>
    <button onclick="deleteData()">点我删除一个数据</button>
    <button onclick="clearAllData()">点我清空一个数据</button>

    <script type="text/javascript">
      let p = { name: "张三", age: 18 };

      function saveData() {
        sessionStorage.setItem("message1", "hello");
        sessionStorage.setItem("message2", 666);
        sessionStorage.setItem("person", JSON.stringify(p));
      }

      function readData() {
        console.log(sessionStorage.getItem("message1"));
        console.log(sessionStorage.getItem("message2"));
        console.log(JSON.parse(sessionStorage.getItem("person")));
      }

      function deleteData() {
        sessionStorage.removeItem("message1");
      }

      function clearAllData() {
        sessionStorage.clear();
      }
    </script>
  </body>
</html>
